Carbureter.



0. C. FUNDERBURK.

CARBURETER.

APPLICATION FILED JULY 29. ms.

1 273,845. Patented July 30, 1918.

- I 2 SHEETS-SHEET I.

3mm Otis I? derb O. C. FUNDERBURK.

CARBURETER.

APPLICATION FILED JULY-29. 191s.

Patented July 30, 1918.

SHEET 2.

Otis Cfincierbv UNITED STATES PATENT OFFICE.

OTIS C. FUNDERIBURK, 0F DETROIT, MICHIGAN, ASSIGNOR TO DETROIT LUBRIGATOR COMPANY, OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN.

CARBURETER.

Specifieation of Letters Patent.

Patented July 30, 1918.

Application filed July 29, 1916. Serial No.'112,046.

To all whom it may concern:

Be it known that I, OTIS C. FUNDERBURK, a citizen of the United States of America, residing at Detroit, in the county of \Vayne and State of Michigan, have invented certain new and useful Improvements in Carbureters, ofwhich the following is a specification, reference being had therein to the accompanying drawings.

The invention relates to carbureters par ticularly designed for use in connection with the twin type of multi-cylinder explosion engine, and 1t is the object of the invention to obtain a more uniform control and distribution of the carbureted air. With engines of the type above referred to, it is usual to provide separate inlet manifolds for the twin cylinder blocks, said manifolds deriving gas either from a single carbureter or two separate carburetors. Where a single carbureter is used, there'is difficulty in obtaining a uniform distribution of the gas between the two manifolds. On the other hand, where separate carbureters are used it is difficult to maintain uniform adjustment. It is the object of the present invention to overcome these difficulties by a construction of carbureter in which there is combined with a single means for mixing the liquid fuel and air independent throttling means controlling the distribution of gas to the two manifolds. The invention further comprises various features of construction as hereinafter set forth.

In the drawings:

Figure 1 is a vertical longitudinal section through the carburetor;

Fig. 2 is a section in a plane at right angles to Fig. 1;

Fig. 3 is an enlarged horizontal section on linem-m Fig. 1; and

Fig. 4 is an enlarged section through the equalizing passage, showing a modified construction.

- The casing of the carbureter comprises a section A, provided with the air inlet opening 13 and an automatic air-valve C for controlling the passage of air into a mixing chamber D, the .latter being preferably formed in a separate section E of the casing. F is the liquid fuel discharge nozzle, which as shown is arranged centrally of the air-valve C and cooperates with a fuel regulating pin G for varying the flow of the liquid according to the position of adjustment of the air-valve. The specific construction of the mixing means is not, however, essential to the present invention, and the construction shown is merely i-e ir'esel'itzrtii'e of any suitable construction for proportionately mixing a liquid fuel and air. I

\Vhere a single carbureter is used for supplying gas to twin manifolds, it is usual to place the throttle valve in the carbureter outlet and then to branch to the two manifolds. This, however, results in an unequal distribution of gas due to surging back and forth from one cylinder to another and to varying piston velocities. \Vith my imprgved construction the connection to the carbureter of the twin manifold is below the throttle, and in place of a single throttle a twin throttle is employed. Thus, as shown, the casing E has the upper portion thereof formed with parallel conduits H and H therein, separated from each other by a partition I. These conduits H and H are connected to the separate manifolds J and J and therefore constitute separate and distinct passages from the mixing chamber D to the cylinders of the twin blocks. K and K are throttle valves, preferably of the butterfly type, which are arranged respectively in the conduits H and H, these being preferably arranged upon a common stem L which passes through the casin E and an aperture M in the division wal I thereof. The valves K and K are attached to the stem so as to be moved simultaneously and correspondingly, and consequently an equal throttling effect is produced in each of the conduits for every position of adjustment of the stem. There is not, however, any opportunity for one manifold to rob the other, as the common connection is below the throttle and is unaffected by the position thereof.

In idling position the restriction of the passage produced by the closed throttle is so great that it would be difficult to exactly balance one side with the other. therefore provided an equalizing connection which is itself sufficiently restricted not to affect the operation in working positions of the throttle. As shown, this equalizing connection is formed by a cross slot N in the division wall I above the plane of the throttle valves K and K. This equalizing slot may be utilized for the further function of a primer, as shown in the modified con- I have struction, Fig. 4, in which 0 is a passage extending from the supply of liquid fuel into the slot N, and P is a passage extending from the external atmosphere into said slot N. These passages O and P are arranged at an angle to each other and the arrangement is such that when the throttle is closed and high vacuum exists in the slot N, the inrushing air through the passage P will form an injector and atomizer, raising the liquid fuel through the passage 0 and spraying it into the manifold.

What I claim as my invention is 1. In a carburetor, the combination with a single mixing chamber and means for supplying air and liquid fuel thereto, of separate discharge conduits connected witlrsaid mixing chamber, and a throttle for each of said separate conduits beyond their point of communication with said chamber.

2. In a carbureter, the combination with a casing having a single mixing chamber therein with an air inlet thereto and parallel discharge conduits separated from each other by an intermediate partition, means for supplying liquid fuel to said mixing chamber, throttle valves in the separate conduits, a common actuating stem therefor, a restricted equalizing passage extending through the intermediate partition, and liquid fuel and air inlet passages communicating with said equalizing passage, for the purpose described.

3. In a carbureter, the combination with a casing having a single mixing chamber therein with an air inlet thereto and discharge conduits separated by a partition, means for supplying liquid fuel to said mixing chamber, throttle valves in the respective conduits, a common actuating means therefor, a restricted passage extending through said partition for equalizing the flow in said conduit when the valves are in idling position and a liquid fuel passage communicating with said equalizing passage for the purpose described.

4. In a carbureter, the combination with a single mixing chamber and means for supplying air and liquid fuel thereto, of separate discharge conduits connected with said mixing chamber, a throttle for each of said separate conduits beyond their point of communication with said chamber and a common actuating means for said throttles.

In testimony whereof I afiix my signature in the presence of two witnesses.

OTIS C. FUNDERBURK.

Witnesses:

ADELAIDE I. ADAMS, ARTHUR D. PULVER. 

